Turret press



April 19 50 H. STUDLI ,50

TURRET PRESS Filed Aug. 17, 1945 7 Sheets-Sheet l 1 l/wavrqe."

April 18, 1950 STUDL; 2,504,751

' TURRET PRESS Filed Aug. .17, 1945 7 Sheets-Sheet 2 H. STUDLI TURRETPRESS April 18, 1950 7 Shee'ts-Sheet 5 Filed Aug. 17, 1945 H. STUDLIApril 18, 1950 TURRET PRESS 7 Sheets-Sheet 4 Filed Aug. 17, 1945 Vlwewram AQmaM' I L -11 I FIG. 12

H. STUDLI TURRET PRESS April 18, 1950 7 Sheets-Sheet 5 Filed Aug. 17,1945 Ila/rimme- H. STUDLI TURRET PRESS April 18, 1950 7 Sheets-Sheet 6Filed Aug. 17, 1945 H. STUDLI TURRET PRESS '7 Sheets-Sheet 7 F/G. If

April 18, 1950 Filed Aug.

Patented Apr. 18, 1950 TURRET PRESS Hans Studli, Winterthur-Hard,Switzerland Application August 1'7, 1945, Serial No. 611,07

In Switzerland June 26, 1944 Section 1, Public Law 690, August 8, mePatent expires June 26, 1964 10 Claims. (01. 18-20) My present inventionrelates to improvements in fluid-operated presses particularly for themanufacture of bodies from synthetic resins or plas tics, having aplurality of press-units each provided with a press-cylinder andpress-tools or dies and secured to a turn-table structure, the latterbeing intermittently rotated step by step past a pay-out station for theblanks, a press-fluid tanking station, a press-fluid dischargingstationand a delivery station for the final products.

The objects of my improvements are first, to render the press-unitsindependent of any outside pressure-fluid feed by providing a singletanking station to which each press-cylinder in succession is connectedat the very moment when a pressing is to take place, such a provisionalso saving pump power; second, to afford a positive black-feed andpay-out operation; third, to adapt the delivery mechanism for the finalproducts also for stripping threaded products from the dies; and fourth,to control and time all individual movements and operations from acommon cam shaft.

I attain these and related objects by the multiple press shown, by wayof an example, in a single embodiment of an oil-pressure operated press,in the accompanying drawings, in which:

Fig. 1 is a sectional elevation of the press with one press-unit in theposition of delivery of the final product,

Fig. 2 shows partly an elevation and partly a section on the line II-IIof Fig. 1,

Fig. 3 a vertical section, in a larger scale, of a press device in theposition of delivery of the final product, and of the device forremoving the latter,

Fig. 4 a vertical sect on, in a larger scale, of a press device in thepressing position,

Fig. 5 a horizontal section on line V-V through the press devices, andon line V'V, of Fig. 1,

Fig. '6 a top plan view of the blankpay-out device,

Fig. 7 a horizontal section, on line VII-VII of Fig. 9, throughthe'drive mechanism of the latter device,

Fig. 8 an elevation of the latter,

Fig. 9 a. vertical section of thelatter.

is'raised against the spring 33, until the seats.

Fig. 10 a a t elevation of the drive for the intermittent andstepeby-step rotation of the pressunit turn-table,

Fig. 11 a vertical section, in larger scale, on line X[XI of Fig. 2, ofthe drive,

Fig. 12 shows, in a larger scale, a vertical section of the press tools,and

Fig. 13 a horizontal section on line XIIL- XIII .bore of the'extensionf2'9 ,by the stem. 34. air volume in thebore-of the pistonextension 29' of Fig. 1, and a, top plan view of the device for.

removing the press products.

A turn-table in the form of a pedestal body comprising a bottom abutment4, and a composite top abutment 6-! connected to the latter by means ofthe columns 5, is pivoted, by means of roller bearings 3, on the quill 2fastly secured to The said top abutment is are securedto the bottomabutment i by their bored axles 29.- Each of said presses comprises ahollow piston 3 (Fig. 4), upon which the press cylinder l0 may bedisplaced. A cylindrical holder 12 is secured to the latter by means ofthe $110111?! dered stud II. The matrix or die I3 is exchangeablysecured to the said holder 12. A helical spring l4, interposed betweenthe flange 6 and the cylinder head, tends to push the cylinder Illdownward over the piston 9 for the purpose of discharging thepress-fluid which, in this case, is oil. The latter is supplied by apump it continuously driven by the electric motor l5 (Fig. 1). Thepressure line l8 (Fig.- 4) and a pipe [9 leading to the pumpsuction-chamber are disposed in a casing I1, and a valve 20,intermediary of said lines l8l9, is intermittently opened and closed bya cam disc 2| by way of the lever 22 and the rod 23. In Fig. 4 the valveis closed, and the press oil flows through the pipe 24 into the boredpedestal 25, the upper portion of which is acting as a cylinder 25. Ahollow piston 27 reciprocates in the latter, and is provided with avalve seat 28 sealing against the valve seat 33 disposed in an extension29 of the saidpiston, and providing, in accordance with its position inFig. 4, a connection between the press-oil l ne 24 and the presscylinder Ill. A valve 32, loaded by the spring 3|, is provided in thepiston 21, and a helical spring 33, hearing in the pedestal and on thetop of the piston 21, tends to draw the latter downwardly. The springs33 and 3| are so designed that, when press oil enters the pedestal 25,the piston 21 28 and 30 are sealed, upon which the valve 32 is openedand admits oil into the press cylinder l0.

.A check valvev 35 is ton 9-, loaded. by the spring 36-and guided in theThe is used for the production and, respectively, the

maintenance of an air pad in the press cylinder portion of its guidestem- 34 projects downwardly housed in the stationary pis beyond thevalve seat 30, and the valve may be lifted, for the purpose ofdischarging the oil from the cylinder l0, by a stationary trip in theform of a roller 3'! whenever the corresponding press-unit is movedthereabove in turning the turn-table 41.

In contrast to: other presses, 'thelpress according to the presentinvention does not possess a stationary pressure pipe for each of theten press-- cylinders, but only this charging nozzle common to all ofthe latter. All pressing devices are'successively charged withpressingoilbyzturning the turn-table 4 step by step above thisdispensing ter. each switching step, an axiallyz displaceable tapereddog 41 (Fig. 3) is provided, which-en'- gages the interderital gap 48in, the plates' 49 fastly secured tangentially to-the abutment 4; Thedog 41 (Fig. '3') is controlled in its reciprocating movementby a'camiil by way of the rigging;lla,:50b and50c.

Ablank pay-out'device (Figs; 6-9) common to' all "pressing devices;i's'provided for, feeding the material "to be. pressed asyflat circularblanks. The said charging device comprises a disk 52 crenellated to formpockets 5l"(Fig. 6') and secured oni'a pin 54 :which is pivoted in acasing adapted as container53. The'latter isin a slantingposition,i..'e. inclined towards'a channel 55 so "that the blanks drop from thepockets 5! into the latter. towardtthe pressing'devi'ces't'o permit theblanks of sliding on into the pressing tools It secured" in. the holderI 2 (Fig. '1)

The disk 52 is moved bya switchgear (Fig. 7 comprising a ratchet wheel'56 and a pawl 57 whichis coupled to'a dog 58 by means of a spring 59.The pawl 5! is fulcrumed in a. swing arm 60 pivoted on the said pin54'and actuated by way of a link 6! by'means oia lever "62, which latteris operated by the cam disk63. obliquity of the blank'pay-out structure,the said link is provided with, ball-and-socket joints. The speed atwhich the disk'52' is driven bythe gear 55-57 is at least twice. asgreat'as required by the number of blanks fed. to the tools, so as toavoid any interruptionoi the feed'notwithstanding the possibility'thatqsome .of' the pockets 5! be empty. In order, now, to prevent aclogging of the trough 55 by blanks at this, for. a normal feedexcessive speed, a cranked feeler'arm 64 is" provided' which projectsinto the channel 55 with. itsslotted end, on which latter a pin 65 isscrewfasten'ed. The said arm is secured to an axie pin 66 journaled inthe housing 53 and provided with a lug 6? cooperatingwith the pawl 57.An-

other log 68 is secured to'the swingarm-Bll, and. abuts against the lug61 when. the said, arm .is rocked ?in the one direction and ithus.swings :the feelerarm '64 into its operative position; When the swingarm 60 swings backin'the other direction, the lugs "'67 and 68 becameseparated, and the feeler arm 64 is lowered 'for feeling into thechannel 55; When meeting a blank, this .is the signal that'a sui-licientnumberzof blanks are in the 'channel. and the lug 61 occupies suchaposi- The channel '55 is sloped downward.

Due to. the

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" station.

'ing with pressed products in the 'form of in-- ternally threadedclosure caps forbottlgand'like Fig. "1 2 shows such a cap 1'3 in sec- 4tion that during this swinging back the rearward arm of the pawl 51 hitsthe lug 61, thereby turning the pawl out of the range of the ratchetwheel 56 so that no clicking takes place upon the forward swing of thearm 60. If the feeler arm 64 does not rest upon a blank, the lug 61 isin such a positionrasnot torengageithe pawl 51, the latter remaining inmesh with the switching teeth of the ratchet. wheel 56 so that the disk5Z..is.iurther rotated and the trough is further charged with blanks.

To'erisurethat atany one time, only one blank is moving from the trough55 to the press tools inthe'ir charg'ingpos'ition, a swing lever 39 isprovidedwhiclion its forward end carries two knives wwand 'll'ioppositeone another. In the position occupied by' the swing lever 69 accordingto Fig.

6, the knife ill has entered into the trough 55 and is in front of thefrontmost blank. If blanks have to be fed, the blade H! is withdrawnfrom the channel and releases"the'frontmost blank to slide cit towardthe press tools'. At the same time,-the-b1ad-e H enters into the "troughand prevents the penultimate blank from sliding together with thefrontm'ostblank. In the suc ceeding play of'the swing lever 59, theblade it releases the now frontmost'blank, and all blanks inthetrough'slide downward, the irontmost blank being retained'bythe knifeill which iin the meantime has entered into the trough, and the dispensing cycle starting anew; The-swing lever BE-isdriven'by a camdisk-12*(F-ign2).

A device, common to ail pre'ssum'ts, for-removing the final 'productsisprovided at the 'payou-t It isassumed herethat "we are deal containers.tion and the press tools. The latter" comprise the bottom tool I3 whichis exchangeabl-y'seeured" in the holder l2 and-defines the-outer form-oithe-- screw cap i3, and the top (1001115 provided with a threaded studpin hi, which is exchangeabiy" secured in-"the top fiange i of theturn-table m! means of the screw '18.

To remove this press product, it 1 must 198*1121 screwedfrom'thetoppressing tool"Hi-'---'i5.' This is done by a sleeve 68pivotedin'arestfl and provided with grippers 1 9 which engagetheinto theinoperative positiomshown 'ina Fig. :13 L'by thedash-and-dot lines. Thehub 83 is adjust:- able in elevation in order to bring the rocked sleeve"is up-ward into that position :in: .whichilthe grippers l9 co-act withthe pressed article. The,

rest 11 is swung in: and out by the action of e.

cam disc 84 overaswinglevenfidand.arodflfi (Figs. .1-3).. The rest. .1I. v.raised.. and lowered by the action of a. cam' diskfil over.swingdever J 8t and grooved set collar 'edscrewed iast'. on .the

"hub 83, while the fork 81 raised. and. lowered by "the cam disc actingupon the swing lever 9|, the grooved set collars"! "and the tapp'et H3.The cam-discs and 'levertransmissionsare suitably chosen. so that thelowering movement :is adapted "to' the "thread pitch oithe final"product.

The sleeve I8 is rotated by a motor" over a V-belt drive 959| and gearwheels 98-402, the stationary pinion 98 having such a width of teeth asto ensure the meshing with the' wheel 99 even during the verticalmovements lofrthe rest 11. h

The closure cap, unscrewed from the stud I4 of the press tool I5, isstill held by the grippers I until the take-ofi device has first beer'rlowered and then swung out into its inoperative position. By depressingthe fork 8| or, respectively, by lifting the rear end thereof, thegrippers I9 are slacked; the final article is freed fror'fri thegrippers and drops into the chute I3.

As described above, all motions required for the stepwise turning of theturn-table with the individual presses, for the actuation ofthe-blankfeeding device, for the feeding of a pressuremedium to eachindividual press, and of-the device for removing the final productsandappurtenant motions are actuated by cams "secured to a common cam shaftI03. The drive' for the latter, as shown in Fig. 11, comprises the motor04, a change-speed drive of the expansion roller type having adjustablecone discs I04, HIS-and V- belts I 06. This change-speed drive isadjusted by means of a handwheel I01 (Fig. 2), a shaft I08, bevel gearsI09, spur gears IIO, III and an externally threaded sleeve II2, whichlatter serves for adjusting the bottom cone disc I0 4--relative to thetop disc I05. A worm I I4 is fastlysecured to the shaft H3 of the conediscs I04 and engages a worm wheel H5 secured to-the cam shaft I03.

An excess pressure valve is provided in the pressure line I8 of thepump, comprisinga tapered valve stem H6 and a valve seat H8 loaded bythe spring I. A handwheel IIO permits of adjusting the spring pressureand thus the desired-- 9 and cylinder III or from thecheck valveiscaught in the pan I22 provided on the bottom abutment 4, and flowsthrough filters I23 into the sump I20. Oil-losses due to leaks do notimpair the function of the individual presses, since, as describedabove, an air pad is provided in each cylinder I0 which permits of onlya gradual pressure drop. In the manufacture of pressed products of, e.g., a synthetic resin, it is sufficient when the maximum pressure ismaintained over only a short length of time. The pressure then maygradually drop to zero during the rotation of the press devices from theoil-charging station to the pay-out station of the final product, sinceno special pressure is required for the condensation of the pressproduct made of a synthetic resin.

The flanges 6 and I of the head structure of the turn-table areelectrically heated by means of built-in resistances I24 and I25, andthe press tools I5, I6 secured to the flange 1, as well as the lowertool I3 secured on the holder I2 are thus heated by convection andradiation. Thermostats I26 control the temperature of the said flange I,and additional thermostats are provided in the flange 6. Current issupplied to the heating resistances I24 and I25 by the lines I2'I whichpass from below through the quill 2, and by the slip rings I28. For thepurpose of heat insulation, insulating layers I20 are provided, as wellas a 6. bell I30 extending downwardly over the top struc--, ture of thebearing. Said bell is suspended from wires I3I which run over sheavesI32 and are anchored in counterweights I33 to permit of readily liftingsame e. g. for the purpose of exchanging the press tools.

Having described the action and operation of the various parts ofthemachine, a repeated description of the overall operation may bedispensed with. It will be observed that the stepby-step motion of theturn-table and thus of the ten individual presses represented in Fig.13, is taking place, e. g., in the sense of the arrow shown. One of thesaid presses being positioned at the delivery station A for the finalproducts, the preceding press is under the pay-out station B for theblanks, the second preceding under the charging station 0 for thepressure-medium, while the next following is on the point D, on whichthe pressure-medium is discharged by lifting the check valve and wherethe pressure tools are moving away from each other. In the pressespositioned between the points C and D the condensation of the syntheticresin is taking place, if such a material is used for the manufacture ofthe pressed articles. All of the ten pressing devices pass these pointsone by one.

In such an individual press more than a pair of pressing tools may bedisposed also, and instead of removing the final products by means ofthe grippers described, they also may be blown off the upper or thelower press tools, provided that they are not threaded. The compresed-air feed may be controlled by a cam I34 of the cam shaft I03.

Only those features of the machine which are of specific interest forits operation, have been described above. Aside from these, safetydevices are provided for, such as electrically operated lockingappliances which, e. g., permit of moving theturn-table only when, e.g., the cylinder has reached its lowest position, in order to prevent acollision between the device for removing the pressed products and thelower pressing tools which have not yet been entirely lowered, whichmight cause damages to the machine.

What I claim and desire to secure by Letters Patent is:

'1. A press of the class described, comprising in combination, aturn-table, a plurality of pressunits each provided with a pressurecylinder reciprocably mounted on said turn-table and with a die fixedlysecured to said turn-table, means for intermittently turning saidturn-table to bring each press-unit successively into a determinedposition in which each press-unit starts its operation, a blank pay-outmechanism for dispensing blanks to each press-unit successively, a pumpsupplying pressure fluid, a pressure dispensing device, coupling meansincluded in said pressure dispensing device and arranged at saidoperating position for mechanically connecting successively eachpressure cylinder with said pressure dispensing device for producing thepressed article, a pressure relief valve in said pressure dispensingdevice and arranged on the pressure side of said pump, a final-productdelivery mechanism including means for removing the pressed articlesfrom the dies of each successive press-unit, and cam means forcontrolling said pressure relief valve and the means for intermittentlyturning the said turn-table and the said blank pay-out and final-productdelivery mechanism in timed relationship.

2. A press according to claim 1, and in which the pressuredispensingdevice comprises a staa tionary cylinder, a conduitforsupplying pres-- sure fluid toisaid cylinder, a spring-loaded holloW- piston 'reciprocable in said cylinder and formingpart ofsaid-coupling means for mechana ically connecting the press cylinders ofsuccessive superjacent press-units by action-of the fluid pressure, 7and a spring-loaded 'valve disposed within the said hollow piston andopening only whenthesaid connection has beenestablished.

-31; Anpress according to claim 1, and a hollow piston. provided in thecylinders of each press-:

unit'and secured to and extending downwardly throuehthe said turntableand having a central bore,:a spring-loaded check :valve disposed" withinthe-said piston, and a valve stem guide extending through the-said boreto project from the lower endthereof and of a length which is "amultiple oftits'diameter, theair volume in'said guideprovidingandmaintaining an air pad in the said cylinders 'ofthepress-unitsat each pressing oporation, and a'stationary dog'disposedbelow the. turntable for cooperation with'the said check valvestemlifting the latter when a press-unit.

passes over it for the purpose of discharging the press fiuid from thesaid cylinder.

4. A press as claimed in claim 1, and'in which the s'aid blank-pay-outmechanism comprises a magazine disc supporting-"blanks andinclinedtoward the press-units, a similarly inclined chute for receivingthe blanks from said magazine disc, driving means for rotating saidmagazine disc intermittently, and safety means for interrupting saiddriving means When said chute is filled with todisengage the pawl fromthe'ratchet wheel when contacting a blank in the-"said" chute. v

6. A press according to claim 1, and a blankfeed-mechanism having amagazine disc forsu-pporting blanks, an inclined chute for receiving theblanks from the latter and feeding same one by one into passingpress-units, and comprising a swing lever having two blades oppositeeach other andprojecting .into the saidchute, one of sa 7 blades,releasing thelfrontemost blank, in the, said chute upon an outwardmovement of the saidswing lever while the other blade at thesame timepasses in front of the succeeding .blankpand prevents same from slidingofi into the respective press-unit. I

7. A press as claimed in claim'i; and in which the saidblank-pay.-out.mechanismcomprises a magazine disc supporting blanks andinclined, toward the press-units, ,a similarly inclinedchute forreceiving the blanks fron said magazinesdiscg driving means for-rotatingsaidmagazineldiscintermittently, and at least twice as fast as required,

bythe number of blanks necessary for, feeding vthe press-.units so toeliminate any'int'erruption in the blank-feed due to themagazine discbeing not fully charged.

8. A press accordingto claim 1,.and;a.,fir;1.ale

product delivery mechanism comprisinga device. for removing thefinal-productsfrom each press, unit in succession, and controlledfromthe said I. cam shaft, said-device being rockable horizontally-- and'displaceable vertically.

9. A press according toclaim 1, and a, .final= 'productdeliverymechanism having a device .ior

stripping'the threaded 'final product from each press unitinsuccessionand controlled from the. said cam-shaft,- said device beingrockable .h0ri--, zontally and displaceable vertically, and com-.1 priin -agripper rotatably n aging the final. product inrthe manner oiawrench for .the,pur-. pose of unscrewing the productiromrthe diaihe'said vertical displacement being adapted toithe steepness-of the threadpitch on the final product.

10. A press according to claim 1, andin the drive mechanism for the saidcam .,shaft includes a chan e-speeda H NS STUDLL REF RENoES CITEDThe-following references-areof record in the file of this patent:

"UNITlilD STATES PATENTS mater Name. Date ,117,400 Cobb. A, 1,. May ,.13 2;;l55,316 Lauterbach Apr. 13, 1939 5i-,Q29. 7 Kin st n P

